524 ME. E. J. LECHMEEE GTJPPY ON THE 



Next to the Orbitoides and Am^Msfegina-rooks come the deeper 

 water beds in which I found Nucula Schomburgki, Leda Packeri, and 

 Stomatia eidolon. The Nucula and the Leda were originally de- 

 scribed by Forbes in Schomburgk's ' History of Barbados,' from 

 specimens found in Barbados. The Nucula is very nearly allied to 

 N. bivirgata Sow., of the Gault, and also to N. Cobboldice Sow., 

 of the Crag, but it is nearer to the former than to the latter.^ The 

 NuGula-'h&di^ are made up of a fine-grained grey rock with a greenish 

 tinge and a conchoidal fracture. They are more coherent and tougher 

 than the Globigerina-'hedis generally, and in external appearance 

 resemble some of the radiolarian marls (especially JN^o. 2). The tail 

 of a fish was found in a nodule in these . beds. Poraminifera 

 (Globigerina, Nodosaria, &c.) occur plentifully. It is here chiefly 

 that Trochammina coronata^ T. conglobata^ and Spiroloculina abound ; 

 these are generally rare in, or altogether absent from, most of 

 the other beds. 



This portion of the section (from Nos. 6 to 9 inclusive) was given 

 in greater detail and upon a different scale in my 1866 paper in 

 this Journal. The strike is somewhat south of west and the beds 

 are nearly vertical. 



Next following are the beds 10, 11, 12, 13, in which the dip is 

 reversed, changing from S.W. to N.E. The organic contents are 

 deep-sea foraminifera, Globigerina-iorms largely predominating, 

 with a few ostracoda, some small fishes' teeth and otolites, and echi- 

 noderm spines. At the southern end of these and near Sipero 

 Creek are quantities of boulders of a hard material. These appear 

 to have been included in the ^ Geological Eeport ' under the term 

 "indurated sandstone." A microscopic examination of these 

 boulders reveals a structure similar to the argiline of Naparima Hill. 

 They are also of a similar but variable and much darker colour. I 

 have not found any such rock in place. Probably it exists in 

 nodular and lenticular masses in the softer strata, whose decay and 

 denudation leave the hard portions to accumulate on the beach. 



Prom the mouth of Sipero Creek to Ally Creek the strata are not 

 exposed, being covered by swamp and mud-flats. Two or more 

 faults occur here. At No. 15 there is a shell-bed containing 

 Nummulina, Cristellaria, Nodosaria (rajyhanistrum)^ and a few 

 other foraminifera, some moUusca, and also fishes' teeth and otolites. 

 This shell-bed is a reddish-brown ferruginous rock with large green 

 grains. The latter often predominate, so that the rock shows green 

 when broken across the planes of deposition, the reddish-brown 

 colour being apparent only when the fracture is coincident with 

 those planes. As the land where this stratum is exposed has slipped 

 very considerably I could not ascertain the true dip or strike, or the 

 relations to the other beds. I am inclined to think, however, that 

 this bed together with the next strata (16, 17) are possibly an ex- 

 tension of Nos. 6, 7, 8, 9, and 10 brought up by the Sipero and 

 Ally Creek faults. Poraminifera-beds now come in again, Nos. 16 



^ See Proc. Sclent. Assoc. Trinidad, 1881, p. 170. 



